20748781600 has 72 divisors (see below), whose sum is σ = 50673037968. Its totient is φ = 8296224000.

The previous prime is 20748781577. The next prime is 20748781619. The reversal of 20748781600 is 618784702.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3557887 + ... + 3563713.

It is an arithmetic number, because the mean of its divisors is an integer number (703792194).

Almost surely, 2^20748781600 is an apocalyptic number.

20748781600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20748781600 is an abundant number, since it is smaller than the sum of its proper divisors (29924256368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20748781600 is a wasteful number, since it uses less digits than its factorization.

20748781600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10298 (or 10285 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 43.

The spelling of 20748781600 in words is "twenty billion, seven hundred forty-eight million, seven hundred eighty-one thousand, six hundred".